US5643376A - Preheating particles in manufacture of pressed board - Google Patents

Preheating particles in manufacture of pressed board Download PDF

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Publication number
US5643376A
US5643376A US08/498,521 US49852195A US5643376A US 5643376 A US5643376 A US 5643376A US 49852195 A US49852195 A US 49852195A US 5643376 A US5643376 A US 5643376A
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United States
Prior art keywords
mat
treatment air
air
treatment
method defined
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Expired - Lifetime
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US08/498,521
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English (en)
Inventor
Klaus Gerhardt
Armin Rapp
Michael Scholer
Hans-Dietrich Sitzler
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Siempelkamp Maschinen und Anlagenbau GmbH and Co KG
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G Siempelkamp GmbH and Co KG
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Application filed by G Siempelkamp GmbH and Co KG filed Critical G Siempelkamp GmbH and Co KG
Assigned to G. SIEMPELKAMP GMBH & CO. reassignment G. SIEMPELKAMP GMBH & CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SITZLER, HANS-DIETRICH, GERHARDT, KLAUS, RAPP, ARMIN, SCHOLER, MICHAEL
Priority to US08/785,239 priority Critical patent/US5733396A/en
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Publication of US5643376A publication Critical patent/US5643376A/en
Assigned to SIEMPELKAMP MASCHINEN-UND ANLANGENBAU GMBH & CO. KG reassignment SIEMPELKAMP MASCHINEN-UND ANLANGENBAU GMBH & CO. KG CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: G. SIEMPELKAMP GMBH & CO.
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/18—Auxiliary operations, e.g. preheating, humidifying, cutting-off
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/24—Moulding or pressing characterised by using continuously acting presses having endless belts or chains moved within the compression zone
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/65—Processes of preheating prior to molding

Definitions

  • the present invention relates to the manufacture of pressed board. More particularly this invention concerns a method of preheating wood particles--fibers and chips--in the production of fiber or particle board.
  • Particle board is typically made by depositing on a belt a thick mat of glue-coated particles, in the case of oriented strand board fibers between 75 mm and 150 mm long, preferably between 100 mm and 120 mm, and about 0.75 mm thick. The mat is then heated and pressed to the desired finished thickness. The pressing can be done continuously in an apparatus such as described in commonly owned U.S. Pat. No. 5,336,077 or in an intermittently operating platen-type press.
  • German patent 1,276,912 describes how the mat is cut into sections and steam is used to heat the mat sections to the pressing temperature. To this end superheated steam at about 105° C. is used.
  • the mat sections are loaded into the opened platen press which is subsequently closed. Then the sections are at first pressed without the application of steam to a smaller thickness than the desired finished thickness. Subsequently the platens of the press are heated by passing the superheated steam through a steam chamber connected to at least one of the platens which is formed with holes or pores so that the steam can get through to the mat section being pressed.
  • a steam chamber connected to at least one of the platens which is formed with holes or pores so that the steam can get through to the mat section being pressed.
  • German patent document 3,640,682 describes how the particle mat is produced continuously and is prepressed somewhat by means of an unheated double-belt press before being preheated.
  • the prepressed mats are then supported on a foraminous belt arranged above and below chambers into which a heated fluid, preferably superheated or saturated steam, is fed under pressure so that it soaks into and heats the mats.
  • a heated fluid preferably superheated or saturated steam
  • Another object is the provision of such an improved preheating method for the making of pressed board which overcomes the above-given disadvantages, that is which allows the preheating to be carried out in an exactly controlled manner.
  • a particle mat for pressing into a pressed board is heated by concurrently passing through the mat treatment air coming from an air-conditioning system and having a predetermined moisture content and dew point, heating the treatment air passing through the mat to a temperature which is greater by a dew-point differential than the dew point of the treatment air, and controlling the volume rate of flow of the treatment air and the moisture content of the treatment air such that the mat is preheated to a predetermined temperature while liquid in the treatment air is allowed to condense in the mat to at most a maximum liquid content.
  • the temperature and moisture content of the prewarming treatment air are controlled as is standard in air-conditioning technology, normally by simply heating the treatment air while evaporating in it enough water to achieve the desired moisture content.
  • the dew point of course is the temperature at which moisture will precipitate out of the treatment air stream, that is the temperature where with a given moisture content the relative humidity of the treatment air reaches 100%.
  • the dew-point differential is a measurement of the moisture of the treatment air. It is the difference between the ambient treatment air temperature and the dew point. A large dew-point differential indicates a high saturation deficiency of the treatment air, that is relatively dry treatment air, and on the contrary a small dew-point differential indicates a higher moisture content, that is relatively humid treatment air.
  • the moisture content here refers as is standard to the water-vapor content of the treatment air as relative humidity. With a relative humidity of 100% the treatment air is saturated with water vapor and excess water vapor will condense out.
  • the invention is based on the recognition that in the preheating of loose particulate matter in the production of pressed board the volume rate of flow of the treatment air, the dew point, and the dew-point differential (and also the treatment time) can be set without difficulty so that the predetermined preheating temperature for the preheated workpiece is attained.
  • the concrete values are determined experimentally for the workpiece in question, whether glue-coated or not.
  • the moisture content of the preheated workpiece can surprisingly be set very accurately when necessary as described below.
  • the treatment air has a temperature above 90° C., preferably above 100° C.
  • the treatment air has a relative humidity of less than 40%, preferably less than 30%.
  • the condensation of the water vapor in the mat is at most 5%.
  • the temperature of the treatment air is set so that it is at least 20°, preferably at least 30° above the temperature to which the mat is to be preheated. This avoids excess condensation in the workpiece.
  • the moisture content and temperature of the treatment air are set by recirculating the treatment air after it traverses the mat through an air-conditioning plant.
  • the mat can be dried prior to passing the treatment air through it so as to reduce the mat's moisture content to compensate for the moisture subsequently regained by condensation from the treatment air passed through it.
  • This drying can be effected by passing through the mat pretreatment air having the same dew point as the treatment air used to preheat it but having a higher dew-point differential.
  • the mat includes wood particles and an adhesive needing a predetermined water content for activation
  • the mat is dried prior to treatment to a lower water content than the content necessary for adhesive activation and the lacking water is condensed out of the treatment air as it is passed through the mat.
  • the mat can be dried.
  • the mat is continuously formed and is continuously passed through a preheating station where the method is carried out.
  • the preheated mat is then passed through a belt-type continuous press for formation into the finished pressed board.
  • the mat can be cut into sections that are preheated and subsequently loaded into a batch-type platen press or the like that works discontinuously, that is where the mat sections are stationary during the pressing operation.
  • the prewarming is done symmetrically, that there is a homogenous distribution of the preheating temperature over the thickness of the mat.
  • the treatment air is passed vertically through the mat. More particularly the treatment air is introduced into the mat from above and from below.
  • the treatment air can be applied simultaneously from above and below at a single location, or at a series of succeeding locations in a continuous process, or alternately from above, then from below. Normally immediately after the mat is prewarmed it is pressed.
  • FIG. 1 is a graph illustrating the invention compared to the prior art in the production of oriented strand board
  • FIG. 2 is a largely schematic view illustrating an apparatus for carrying out the method of this invention.
  • FIG. 3 is a schematic view illustrating an alternative apparatus.
  • FIG. 1 shows on the abscissa treatment time from 0 to 240 sec and on the ordinate temperature from 0° C. to 160° C.
  • a glue and particle mat for production of oriented strand board 12 mm thick is heated in four different manners corresponding to curves 1, 2, 3, and 4.
  • Section I is for preheating and is about 30 sec long
  • section II is transport to the press and is about 50 sec long
  • section III represents the time in the press and is about 145 sec long.
  • Curve 1 represents the prior-art system with no preheating, so that it takes some 225 sec to heat the board to 122° C.
  • Curve 2 shows preheating to 70° C., curve 3 to 80° C., and curve 4 to 90° C.
  • the moisture content of the mat after prewarming is about 10%.
  • curves 2 through 4 show that the desired temperature is reached much sooner with the preheating of this invention, so that in reality the press phase III can be stopped much sooner, thereby substantially increasing production speed since it is normally the press that constitutes the bottleneck in production.
  • the preheating is at a rate or process factor of about 7 sec/mm.
  • the thickness of the oriented strand board to be manufactured is different the quality parameters from the table are similar.
  • the advantageous process factor of 7 sec/mm is the same with reheating to 90° C.
  • the workpiece thickness can be as much as 60 mm.
  • the apparatus shown in FIG. 2 has an input conveyor belt 10 on which a mat M is formed by a particle-depositing hopper 12 so that it moves in a direction D through a prewarming machine 11 to a continuous belt-type press 13. Inside the prewarming apparatus 11 the mat M runs between lower and upper conveyor systems 18 and 19 having respective foraminous belts 17 and 15 spanned over rollers 16 and 14 and forming a passage or nip 20 between which the mat M may be compressed somewhat.
  • An air-conditioning apparatus 24 feeds humidified hot treatment air to an upper compartment 21 via a conduit 23 so it diffuses downward through the mat M. Underneath the mat M the treatment air is caught by another compartment 22 and fed via another conduit 23' back to the conditioning apparatus 24.
  • a controller 25 connected to the apparatus 24 and to unillustrated sensors in the lines 23 operates the system.
  • FIG. 3 where reference numerals from FIG. 2 are used for identical structure, the system is different in that it has four upper air-distribution boxes 21' and four respective lower boxes 22' spaced in the transport direction D.
  • the direction of flow between the boxes 21' and 22' can be reversed with each succeeding pair of boxes and/or the temperature and/or humidity of the treatment air can vary from box pair to box pair.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Manufacture Of Wood Veneers (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
US08/498,521 1994-07-06 1995-07-05 Preheating particles in manufacture of pressed board Expired - Lifetime US5643376A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US08/785,239 US5733396A (en) 1994-07-06 1997-01-17 Preheating particles in manufacture of pressed board

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4423632A DE4423632A1 (de) 1994-07-06 1994-07-06 Verfahren zum Vorwärmen von Streugut auf eine vorgebbare Vorwärmtemperatur im Zuge der Herstellung von Holzwerkstoffplatten
DE4423632.8 1994-07-06

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US08/785,239 Continuation-In-Part US5733396A (en) 1994-07-06 1997-01-17 Preheating particles in manufacture of pressed board

Publications (1)

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US5643376A true US5643376A (en) 1997-07-01

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US08/498,521 Expired - Lifetime US5643376A (en) 1994-07-06 1995-07-05 Preheating particles in manufacture of pressed board

Country Status (9)

Country Link
US (1) US5643376A (de)
EP (1) EP0695609B2 (de)
JP (1) JP3704378B2 (de)
CN (1) CN1060111C (de)
AT (1) ATE162975T1 (de)
CA (1) CA2153280C (de)
DE (2) DE4423632A1 (de)
ES (1) ES2113697T5 (de)
FI (1) FI116969B (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999024233A1 (en) * 1997-11-12 1999-05-20 J. M. Huber Corporation Steam pre-heating in oriented strand board production
US6312632B1 (en) * 1997-05-03 2001-11-06 Maschinenfabrik J. Dieffenbacher Gmbh & Co. Process for the production of wood-based boards having structured surfaces
US6562162B1 (en) * 1998-05-19 2003-05-13 Valmet Panelboard Gmbh Method and device for producing shaped bodies
US20030090022A1 (en) * 2000-10-06 2003-05-15 James Randall Method and apparatus for making building panels having low edge thickness swelling
US6565780B2 (en) * 2000-02-06 2003-05-20 Maschinenfabrik J. Dieffenbacher Gmbh & Co. Method for the continuous production of organically bonded boards of ligneous material
US6572804B2 (en) 2000-10-18 2003-06-03 Borden Chemical, Inc. Method for making building panels having low edge thickness swelling
US20050156348A1 (en) * 2000-10-06 2005-07-21 Randall James W. Method and apparatus for making building panels having low edge thickness swelling
US20070102113A1 (en) * 2005-11-04 2007-05-10 Ainsworth Lumber Co., Ltd. Methods of manufacturing engineered wood products
US20070111019A1 (en) * 2005-11-04 2007-05-17 Ainsworth Lumber Co., Ltd. Methods of manufacturing engineered wood products
US20090077924A1 (en) * 2007-09-21 2009-03-26 Ainsworth Lumber Co., Ltd. Methods of manufacturing engineered wood products
WO2009118574A2 (en) * 2008-03-24 2009-10-01 Ainsworth Lumber Co., Ltd. Methods of manufacturing engineered wood products
CN101229651B (zh) * 2006-12-30 2012-07-18 迪芬巴赫有限两合公司 对人造板生产过程中的板坯进行预压和排气的预压机
US11007668B2 (en) 2017-04-25 2021-05-18 SWISS KRONO Tec AG Process for the production of OSB wood-based boards with reduced emission of volatile organic compounds (VOCs)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19701596C2 (de) * 1996-02-15 1999-03-18 Siempelkamp Gmbh & Co Verfahren und Anlage zum Vorwärmen von Preßgutmatten aus beleimtem Preßgut
DE19627720B4 (de) * 1996-02-16 2004-09-02 Siempelkamp Maschinen- Und Anlagenbau Gmbh & Co. Kg Anlage für die Herstellung von Holzwerkstoffplatten
DE19635410C2 (de) * 1996-08-31 2003-02-27 Siempelkamp Gmbh & Co Maschine Vorrichtung zum Verpressen eines Vlieses zu einem Plattenstrang
DE19647240B4 (de) * 1996-11-15 2005-06-09 Fritz Homann Gmbh & Co. Kg Holzfaserplatte und Verfahren zu ihrer Herstellung
DE20004452U1 (de) * 2000-03-09 2001-03-08 Heggenstaller Anton Ag Strangpresse für mit Bindemitteln gemischte pflanzliche Kleinteile zur Bildung kompakter Stränge
DE10106815A1 (de) * 2001-02-14 2002-08-29 Dieffenbacher Gmbh Maschf Verfahren und Anlage zur Herstellung von Holzwerkstoffplatten
DE10230191B4 (de) * 2002-07-05 2004-09-02 Herbert Georg Nopper Verfahren und Vorrichtung zum Verpressen von Vliesen aus Streugut
DE102005046879A1 (de) * 2005-09-29 2007-04-05 Dieffenbacher Gmbh + Co. Kg Verfahren und Vorrichtung zur Vorwärmung einer gestreuten Pressgutmatte bei der Herstellung von Holzwerkstoffplatten
AU2009253727B2 (en) * 2008-05-26 2010-12-16 Panel Board Holding B.V. Binding particulate materials to manufacture articles
DE102019114021B3 (de) * 2019-05-24 2020-11-12 Siempelkamp Maschinen- Und Anlagenbau Gmbh Verfahren und Vorrichtung zur Vorwärmung einer Pressgutmatte
CN114347342A (zh) * 2021-12-31 2022-04-15 苏州苏福马机械有限公司 一种将pvc塑料或橡胶颗粒压制成卷材板的制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1276912B (de) * 1963-04-22 1968-09-05 Weyerhaeuser Co Verfahren und Vorrichtung zum Herstellen von Holzspankoerpern
US4060580A (en) * 1974-07-16 1977-11-29 Bison-Werke Bahre & Greten Gmbh & Co. Kg Process for the production of shaped components of wood material, especially boards, bound with a hydraulic binder, preferably cement
DE3640682A1 (de) * 1986-11-28 1988-06-09 Baehre & Greten Verfahren und vorrichtung zum kontinuierlichen vorwaermen eines vlieses fuer die herstellung von span-, faser- oder dergleichen platten
US5063010A (en) * 1989-04-28 1991-11-05 G. Siempelkamp Gmbh & Co. Making pressed board

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SE311227B (de) * 1962-09-27 1969-06-02 Weyerhaeuser Co
DE2845080C2 (de) * 1978-10-17 1981-10-08 Casimir Kast Gmbh & Co Kg, 7562 Gernsbach Vorrichtung zum Beheizen eines Vlieses
DE3641465C2 (de) * 1986-12-04 1995-08-03 Uwe Welteke Verfahren zur Herstellung von Wärmedämmplatten aus Fasermaterialien
RU2068339C1 (ru) * 1989-02-14 1996-10-27 СИ ЭС АР Лимитед Устройство и способ непрерывного изготовления древесностружечных плит
US4945652A (en) * 1989-04-18 1990-08-07 Forintek Canada Corporation Controlled steam drying of veneer sheets
JPH0521041A (ja) * 1991-07-09 1993-01-29 New Japan Radio Co Ltd 発光装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1276912B (de) * 1963-04-22 1968-09-05 Weyerhaeuser Co Verfahren und Vorrichtung zum Herstellen von Holzspankoerpern
US4060580A (en) * 1974-07-16 1977-11-29 Bison-Werke Bahre & Greten Gmbh & Co. Kg Process for the production of shaped components of wood material, especially boards, bound with a hydraulic binder, preferably cement
DE3640682A1 (de) * 1986-11-28 1988-06-09 Baehre & Greten Verfahren und vorrichtung zum kontinuierlichen vorwaermen eines vlieses fuer die herstellung von span-, faser- oder dergleichen platten
US5063010A (en) * 1989-04-28 1991-11-05 G. Siempelkamp Gmbh & Co. Making pressed board

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6312632B1 (en) * 1997-05-03 2001-11-06 Maschinenfabrik J. Dieffenbacher Gmbh & Co. Process for the production of wood-based boards having structured surfaces
WO1999024233A1 (en) * 1997-11-12 1999-05-20 J. M. Huber Corporation Steam pre-heating in oriented strand board production
US6562162B1 (en) * 1998-05-19 2003-05-13 Valmet Panelboard Gmbh Method and device for producing shaped bodies
US6565780B2 (en) * 2000-02-06 2003-05-20 Maschinenfabrik J. Dieffenbacher Gmbh & Co. Method for the continuous production of organically bonded boards of ligneous material
US20050156348A1 (en) * 2000-10-06 2005-07-21 Randall James W. Method and apparatus for making building panels having low edge thickness swelling
US20030090022A1 (en) * 2000-10-06 2003-05-15 James Randall Method and apparatus for making building panels having low edge thickness swelling
US6572804B2 (en) 2000-10-18 2003-06-03 Borden Chemical, Inc. Method for making building panels having low edge thickness swelling
US20070102113A1 (en) * 2005-11-04 2007-05-10 Ainsworth Lumber Co., Ltd. Methods of manufacturing engineered wood products
US20070111019A1 (en) * 2005-11-04 2007-05-17 Ainsworth Lumber Co., Ltd. Methods of manufacturing engineered wood products
CN101229651B (zh) * 2006-12-30 2012-07-18 迪芬巴赫有限两合公司 对人造板生产过程中的板坯进行预压和排气的预压机
US20090077924A1 (en) * 2007-09-21 2009-03-26 Ainsworth Lumber Co., Ltd. Methods of manufacturing engineered wood products
WO2009118574A2 (en) * 2008-03-24 2009-10-01 Ainsworth Lumber Co., Ltd. Methods of manufacturing engineered wood products
WO2009118574A3 (en) * 2008-03-24 2009-12-03 Ainsworth Lumber Co., Ltd. Methods of manufacturing engineered wood products
US11007668B2 (en) 2017-04-25 2021-05-18 SWISS KRONO Tec AG Process for the production of OSB wood-based boards with reduced emission of volatile organic compounds (VOCs)
US11904496B2 (en) 2017-04-25 2024-02-20 SWISS KRONO Tec AG Process for the production of OSB wood-based boards with reduced emission of volatile organic compounds (VOCs)

Also Published As

Publication number Publication date
FI116969B (fi) 2006-04-28
CN1060111C (zh) 2001-01-03
JPH0880513A (ja) 1996-03-26
JP3704378B2 (ja) 2005-10-12
CN1121867A (zh) 1996-05-08
DE59501405D1 (de) 1998-03-12
FI953332A (fi) 1996-01-07
CA2153280A1 (en) 1996-01-07
EP0695609A2 (de) 1996-02-07
ATE162975T1 (de) 1998-02-15
DE4423632A1 (de) 1996-01-11
EP0695609B1 (de) 1998-02-04
EP0695609B2 (de) 2002-10-09
ES2113697T5 (es) 2003-02-16
ES2113697T3 (es) 1998-05-01
CA2153280C (en) 1999-02-02
FI953332A0 (fi) 1995-07-06
EP0695609A3 (de) 1996-03-20

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